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Creative Suite and Creative Cloud extensions are applications that leverage the Flex and Adobe AIR® frameworks and integrate inside the Creative Suite and Creative Cloud products to extend their functionality. Apart from ActionScript® code, they can contain native (C++, JavaScript) code. Creative Suite and Creative Cloud extensions that combine native and ActionScript code are referred to as hybrid extensions. They are usually accessible in the Creative Suite and Creative Cloud products from the Window > Extensions menu. When launched, they show up as panels inside the Creative Suite and Creative Cloud products. Learn more about Create Suite and Creative Cloud extensions.

The Adobe Creative Suite SDK is a set of ActionScript libraries that make it possible to build Adobe Flash® technology–based extensions in CS5, CS5.5, CS6 and CC. Developers can include these libraries in their projects in order to create cross-application plug-ins that use the Flex framework and the Adobe AIR 2 API or later, and access the scripting Document Object Model (DOM) of Creative Suite and Creative Cloud applications through ActionScript objects.

Creative Suite/Creative Cloud multiple version support (CS5/5.5/6/CC): Select the version of Creative Suite you want to target and Adobe Extension Builder 2.1 works out the compatible features available for that version.

Using Adobe Extension Builder, you can develop extensions using Flex SDK version 4.5. This is the version supported by Creative Cloud. Note that since Adobe Extension Builder is a Flash Builder plug-in, it supports the same Flex SDK version as Flash Builder. The limitation to 4.5 applies only to extensions developed for Creative Suite and Creative Cloud.

The latest version of Adobe Extension Builder includes backward compatibility, so you can build extensions that run inside CS5, CS5.5, CS6 and CC. Hence, it is unnecessary to have multiple versions installed.

When you buy a subscription to use Adobe Extension Builder, the purchase is tied to your Adobe ID. Purchasing more than one subscription under the same Adobe ID will not provide you additional benefits, nor will it enable you to have multiple users access the software.

As long as you have a valid subscription, you will always be entitled to the latest version of Adobe Extension Builder. So, once a new version becomes available, you will be notified so that you can download it.

Adobe Extension Builder and Flash Builder
Adobe Extension Builder is a Flash Builder plug-in. It leverages many of the features that Flash Builder has (such as code completion, project wizards, and debugging) and adds additional ones to streamline development on top of the Creative Suite and Creative Cloud products.

Adobe Extension Builder and Adobe Photoshop®, Photoshop Extended, InDesign®, InCopy®, llustrator®, Flash Professional®, and Premiere Pro®
Adobe Extension Builder contains a set of libraries, called Creative Suite ActionScript Wrapper (CSAW) libraries, that provide direct access to the Creative Suite applications scripting DOM. CSAW libraries are currently available only for Photoshop, Photoshop Extended, InDesign, Illustrator, and InCopy. CSAW Libraries are now available for Premier Pro CS6 and Flash Professional CS6.